Tizanidine hydrochloride is a medication commonly used as a muscle relaxant. It is primarily prescribed to treat muscle spasms and tightness associated with conditions such as multiple sclerosis, spinal cord injuries, and certain neurological disorders. Tizanidine hydrochloride works by acting on the central nervous system to inhibit the nerve signals that cause muscles to contract, thereby promoting muscle relaxation. It is usually taken orally in tablet form, and the dosage is typically adjusted based on individual response and tolerability. It is important to follow the prescribed dosage and instructions provided by a healthcare professional, as improper use may lead to adverse effects. Common side effects may include drowsiness, dizziness, dry mouth, and weakness. Tizanidine hydrochloride should not be abruptly discontinued, and medical supervision is necessary during treatment.